Matinee by Joe Dante, with John Goodman. It's about a teenager, Gene, who lives on the local army base in Key West, Florida during the Cuban Missile Crisis. While at his favorite spot, the local movie theatre, he meets b-movie director, Lawrence Worley (played by Goodman), who's ready to premier his new movie, Mant, in Key West. Lawrence then takes on Gene as a personal assistant for the 4D presentation of Mant.
The movie borrows a lot of elements from Ciname Paradiso, but it's far from a drama movie. Joe Dante's handprints are all over the movie.